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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: EnumValue.html 878 2015-04-17 01:32:03Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.core;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>/**<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Holds a non-null {@link Enum} value without actually referencing any Java {@link Enum} type.<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Instead, instances hold a name and ordinal value.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * &lt;p&gt;<a name="line.14"></a>
<span class="sourceLineNo">015</span> * Instances are immutable.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * &lt;/p&gt;<a name="line.16"></a>
<span class="sourceLineNo">017</span> *<a name="line.17"></a>
<span class="sourceLineNo">018</span> * @see EnumFieldType<a name="line.18"></a>
<span class="sourceLineNo">019</span> * @see org.jsimpledb.EnumConverter<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>public class EnumValue {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final String name;<a name="line.23"></a>
<span class="sourceLineNo">024</span>    private final int ordinal;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    /**<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * Constructor taking name and ordinal value.<a name="line.27"></a>
<span class="sourceLineNo">028</span>     *<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @param name enum name<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * @param ordinal enum ordinal value<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * @throws IllegalArgumentException if {@code ordinal} is negative<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * @throws IllegalArgumentException if {@code name} is null<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    public EnumValue(String name, int ordinal) {<a name="line.34"></a>
<span class="sourceLineNo">035</span>        if (name == null)<a name="line.35"></a>
<span class="sourceLineNo">036</span>            throw new IllegalArgumentException("null name");<a name="line.36"></a>
<span class="sourceLineNo">037</span>        if (ordinal &lt; 0)<a name="line.37"></a>
<span class="sourceLineNo">038</span>            throw new IllegalArgumentException("invalid negative ordinal " + ordinal);<a name="line.38"></a>
<span class="sourceLineNo">039</span>        this.name = name;<a name="line.39"></a>
<span class="sourceLineNo">040</span>        this.ordinal = ordinal;<a name="line.40"></a>
<span class="sourceLineNo">041</span>    }<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    /**<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * Constructor taking an {@link Enum} value.<a name="line.44"></a>
<span class="sourceLineNo">045</span>     *<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @param value enum value<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * @throws IllegalArgumentException if {@code value} is null<a name="line.47"></a>
<span class="sourceLineNo">048</span>     */<a name="line.48"></a>
<span class="sourceLineNo">049</span>    public EnumValue(Enum&lt;?&gt; value) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>        if (value == null)<a name="line.50"></a>
<span class="sourceLineNo">051</span>            throw new IllegalArgumentException("null value");<a name="line.51"></a>
<span class="sourceLineNo">052</span>        this.name = value.name();<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this.ordinal = value.ordinal();<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * Get the enum name.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @return enum value name<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public String getName() {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        return this.name;<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * Get the enum ordinal value.<a name="line.66"></a>
<span class="sourceLineNo">067</span>     *<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * @return enum value ordinal<a name="line.68"></a>
<span class="sourceLineNo">069</span>     */<a name="line.69"></a>
<span class="sourceLineNo">070</span>    public int getOrdinal() {<a name="line.70"></a>
<span class="sourceLineNo">071</span>        return this.ordinal;<a name="line.71"></a>
<span class="sourceLineNo">072</span>    }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>    /**<a name="line.74"></a>
<span class="sourceLineNo">075</span>     * Find the instance in the given {@link Enum} type that matches this instance in both name and ordinal value, if any.<a name="line.75"></a>
<span class="sourceLineNo">076</span>     *<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * &lt;p&gt;<a name="line.77"></a>
<span class="sourceLineNo">078</span>     * Note: to match only by name, just use {@link Enum#valueOf Enum.valueOf()}.<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * &lt;/p&gt;<a name="line.79"></a>
<span class="sourceLineNo">080</span>     *<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * @param type {@link Enum} type<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * @param &lt;T&gt; enum type<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * @return matching instance of type {@code type}, or null if none exists<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * @throws IllegalArgumentException if {@code type} is null<a name="line.84"></a>
<span class="sourceLineNo">085</span>     */<a name="line.85"></a>
<span class="sourceLineNo">086</span>    public &lt;T extends Enum&lt;T&gt;&gt; T find(Class&lt;T&gt; type) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>        if (type == null)<a name="line.87"></a>
<span class="sourceLineNo">088</span>            throw new IllegalArgumentException("null type");<a name="line.88"></a>
<span class="sourceLineNo">089</span>        final T value;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        try {<a name="line.90"></a>
<span class="sourceLineNo">091</span>            value = Enum.valueOf(type, this.name);<a name="line.91"></a>
<span class="sourceLineNo">092</span>        } catch (IllegalArgumentException e) {<a name="line.92"></a>
<span class="sourceLineNo">093</span>            return null;<a name="line.93"></a>
<span class="sourceLineNo">094</span>        }<a name="line.94"></a>
<span class="sourceLineNo">095</span>        return value.ordinal() == this.ordinal ? value : null;<a name="line.95"></a>
<span class="sourceLineNo">096</span>    }<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span>// Object<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    @Override<a name="line.100"></a>
<span class="sourceLineNo">101</span>    public String toString() {<a name="line.101"></a>
<span class="sourceLineNo">102</span>        return this.name + "#" + this.ordinal;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    @Override<a name="line.105"></a>
<span class="sourceLineNo">106</span>    public int hashCode() {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        return this.name.hashCode() ^ this.ordinal;<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    @Override<a name="line.110"></a>
<span class="sourceLineNo">111</span>    public boolean equals(Object obj) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>        if (obj == this)<a name="line.112"></a>
<span class="sourceLineNo">113</span>            return true;<a name="line.113"></a>
<span class="sourceLineNo">114</span>        if (obj == null || obj.getClass() != this.getClass())<a name="line.114"></a>
<span class="sourceLineNo">115</span>            return false;<a name="line.115"></a>
<span class="sourceLineNo">116</span>        final EnumValue that = (EnumValue)obj;<a name="line.116"></a>
<span class="sourceLineNo">117</span>        return this.name.equals(that.name) &amp;&amp; this.ordinal == that.ordinal;<a name="line.117"></a>
<span class="sourceLineNo">118</span>    }<a name="line.118"></a>
<span class="sourceLineNo">119</span>}<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>




























































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